GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Tracker - 4WD 🢒 Engine 🢒 Engine Mechanical - 2.5L (LE8) 🢒 Camshaft Replacement - Left Side

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the negative battery cable.
  2. Remove the engine front cover. Refer to Engine Front Cover Replacement .
  3. Remove the spark plugs. Refer to Spark Plug Replacement in Engine Controls - 2.5L.
  4. Remove the left secondary timing chain. Refer to Secondary Timing Chain Replacement - Left Side .
  5. Remove the camshaft position (CMP) sensor. Refer to Camshaft Position Sensor Replacement .

    6. Object Number: 648137 Size: SH
  6. Loosen the camshaft bearing caps in sequence.
  7. Remove the camshaft bearing caps.
  8. Remove the camshafts.

Installation Procedure

    Object Number: 648577 Size: SH
  1. Verify that the keyway on the crankshaft (2) is properly positioned.
  2. Apply engine oil to the camshaft journals and lobes.

    3. Object Number: 648629 Size: SH
  3. Install the camshafts aligning the guide pins (1,3) with the marks (2,4) on the cylinder head. The exhaust camshaft rear end is slotted to mate with the camshaft position sensor.

    4. Object Number: 648144 Size: SH
  4. Install the dowel pins (2) to the cylinder head.
  5. Apply a bead of GM P/N 12346240 or equivalent to the exhaust camshaft end housing sealing surface (3).

    6. Object Number: 465393 Size: SH

    Notice: Avoid installing the bearing caps incorrectly. Cylinder head and camshaft damage may result.

  6. Install the camshaft bearing caps. The caps are marked intake or exhaust (1), position away from the timing chain (2), and direction toward the timing chain (3).
  7. Apply oil to the camshaft bearing cap bolts.

    8. Object Number: 648137 Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  8. Tighten the camshaft bearing caps.

    9. Tighten
    Tighten the camshaft bearing caps in 3 progressive steps in the sequence shown to 12 N·m (8.5 lb ft).

  9. Install the camshaft position (CMP) sensor. Refer to Camshaft Position Sensor Replacement .
  10. Install the left secondary timing chain and tensioner. Refer to Secondary Timing Chain Replacement - Left Side .
  11. Install the spark plugs. Refer to Spark Plug Replacement in Engine Controls - 2.5L.
  12. Install the engine front cover. Refer to Engine Front Cover Replacement .
  13. Inspect and adjust the ignition timing if necessary. Refer to Ignition System Timing Adjustment .